Abstract
The difference in microstructure of two Pleistocene clays is studied. Osaka bay clay and Kyoto clay consist of the same minerals, belonging to the Osaka Group (Osaka bay clay is Ma11, and Kyoto clay is Ma4). According to the series of observation by SEM, it is known that the content of Diatom of Osaka bay clay is much larger than that of Kyoto clay. The change of micro pore size distribution due to one-dimensional consolidation was studied by a mercury intrusion porosimeter. The pore size distribution of Kyoto clay changed sensitively with the increment of consolidation pressure, however, in the case of Osaka bay clay, the change was not so clear as Kyoto clay. In the final consolidation pressure of 10MPa, the pore size of Kyoto clay was smaller than 0.1μm, while that of Osaka bay clay ranged between 0.01μm and 0.3μm. The reason of this difference is related with the content of microfossils such as Diatoms.
